Cochron boiler

      
           

The boiler has a dome-shaped furnace top that forms the bottom of the boiler itself. It has a neck on the front through which the boiler is fired and there is another on the rear part of the top that leads to a higher located combustion chamber. The combustion chambers backside is covered with brickwork and from its front-side a horizontal bank of flue-tubes leads to the smoke box on the front side of the boiler.

The Cochran donkey boiler, or auxiliary boiler, was used in harbor when the main boilers were not needed for the propulsion of the ship and consequently the steam demand was low.